CVE-2024-26704

Kernel crash via stale extent-move accounting

Published Apr 3, 2024 · Updated Aug 5, 2026

Double-free in Linux kernel ext4 allows local users to crash affected systems through crafted extent moves followed by filesystem trim. The ext4_move_extents() loop leaves moved_len at zero after a partial success, so inode preallocations are not discarded and overlapping blocks are freed twice. Exploitation requires local low-privileged access to an ext4 filesystem and a later trim operation; the bounded consequence is a kernel crash.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double-free in Linux kernel ext4 allows local users to crash affected systems through crafted extent moves followed by filesystem trim. The ext4_move_extents() loop leaves moved_len at zero after a partial success, so inode preallocations are not discarded and overlapping blocks are freed twice. Exploitation requires local low-privileged access to an ext4 filesystem and a later trim operation; the bounded consequence is a kernel crash.

The record

CVE
CVE-2024-26704
Published
Apr 3, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.18
  2. Affected versionversion=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <185eab30486ba3e7bf8b9c2e049c79a06ffd2bc1
  3. Affected versionversion=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <2883940b19c38d5884c8626483811acf4d7e148f
  4. Affected versionversion=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <55583e899a5357308274601364741a83e78d6ac4
  5. Affected versionversion=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <559ddacb90da1d8786dd8ec4fd76bbfa404eaef6
  6. Affected versionversion=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <afba9d11320dad5ce222ac8964caf64b7b4bedb1
  7. Affected versionversion=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <afbcad9ae7d6d11608399188f03a837451b6b3a1
  8. Affected versionversion=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <b4fbb89d722cbb16beaaea234b7230faaaf68c71
  9. Affected versionversion=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <d033a555d9a1cf53dbf3301af7199cc4a4c8f537

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.18; version=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <185eab30486ba3e7bf8b9c2e049c79a06ffd2bc1; version=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <2883940b19c38d5884c8626483811acf4d7e148f; version=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <55583e899a5357308274601364741a83e78d6ac4; version=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <559ddacb90da1d8786dd8ec4fd76bbfa404eaef6; version=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <afba9d11320dad5ce222ac8964caf64b7b4bedb1; version=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <afbcad9ae7d6d11608399188f03a837451b6b3a1; version=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <b4fbb89d722cbb16beaaea234b7230faaaf68c71; version=fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a <d033a555d9a1cf53dbf3301af7199cc4a4c8f537

Published CVSS scores

7.8Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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